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Exchange online protection mail flow connector setup RRS feed

  • Question

  • I need assistance with the setup of my mail flow connector from Office 365 to my organization. My exchange environment has been up and running for a couple of years with mail flowing through an Edge Subscription on ForeFront TMG 2010 (I now need to direct the mail flow through Office 365). I can successfully Telnet to my external IP on port 25 and in my understanding this should be sufficient to (without any changes to my TMG setup) directly point the Office 365 connector to this public IP address. On validation of my mail connector I get the following error: "Failed to connect or authenticate to internal server with error 'One or more errors occurred.', please try again later.". The domain setup and DirSync steps have already been completed on Office 365.
    Friday, January 8, 2016 5:52 PM